Absorption heat pump for overfeed generator operating conditions

摘要

An absorption heat pump with a system for improving its efficiency under generator overfeed conditions. The absorber is bypassed to direct the rich solution directly into the generator, mixing this rich solution with liquid refrigerant.

主权项

1. An absorption heat pump comprising:
a generator or desorber for generating, from a first fluid, vapour for feeding via a first line to a first condenser in heat exchange contact with heat transmission fluid for cooling the vapour, said first condenser having an inlet for the vapour and an outlet for the cooled vapour, downstream of the first condenser a second line entering an evaporator, the second line comprising at least a first throttle valve, an evaporator outlet connected by a third line to an absorber inlet for passing vapour from said first fluid into an absorber, the absorber comprising an enriched solution outlet for discharging an enriched solution of said first fluid absorbed in a second fluid, a heat exchanger having an enriched solution inlet and an enriched solution outlet, the absorber enriched solution outlet connected to the enriched solution inlet of the heat exchanger, the heat exchanger in heat transmission contact with heat transmission fluid, the enriched solution outlet of the heat exchanger connected to a suction side of a pump, a circuit in heat transmission contact with the absorber, the circuit having a circuit inlet and a circuit outlet, the delivery side of the pump is connected by a fourth line to the circuit inlet, a fifth line connected to the circuit outlet to connect said circuit to a rich solution inlet of the generator, a bypass line having a bypass line inlet and a bypass line outlet, the bypass line inlet connected to the fourth line upstream of the circuit inlet, the bypass line outlet connected to the fifth line downstream of the circuit outlet, the generator having a poor solution outlet connected by a sixth line provided with a throttle valve to a poor solution inlet of the absorber, the fourth line connected to the bypass line positioned for having rich solution from the fourth line at most partially bypass the circuit, a withdrawal line for introducing liquid refrigerant from the second line into the rich solution at an introduction point downstream of the pump into the bypass line, or a portion of the fourth line upstream of the connection to the bypass line inlet, and the bypass line comprises a valve for closing the bypass line.